1. Department of Obstetrics and Gynaecology, Monash University, Clayton, Australia;
2. Department of Obstetrics and Gynaecology, Ziekenhuis Groep Twente, Almelo, The Netherlands;
3. Department of Obstetrics and Gynaecology, Amsterdam Medical Centre, Amsterdam, The Netherlands;
4. Department of Medical Informatics, Amsterdam Medical Centre, Amsterdam, The Netherlands